Abstract: This paper introduces the ECG(electrocardiogram) real-time filtering algorithms for power-line interference, electromyography noise, and base-line drift, and implemented by a digital signal processor on digital ECG instrument. In order to get high quality ECG signal, a notch filter is used to eliminate the power-line noise with base-line shift and a low-pass filter is used to eliminate the muscle noise. The experiment results prove that the filtering algorithms have the advantages of fast speed and effectual effect.

Key words: electrocardiography, digital signal processor, base-line drift, power-line interference, electromyography